John of Lusignan

John of Lusignan (1329-1375) was the regent of the Kingdom of Cyprus and the titular ruler of the defunct Principality of Antioch (which had fallen to the Bahri Sultanate in 1268). He was the son of King Hugh IV of Cyprus and Alix of Ibelin, and he was the brother of the future King James I of Cyprus. John married Frederick III of Sicily's daughter Constance, and he later married Alice of Ibelin after a childless marriage. Along with his brother James, he was tasked with repelling the Republic of Genoa's invasion of Cyprus by his nephew Peter II of Cyprus from 1373 to 1375, but he was murdered by Eleanor of Aragon for his alleged role in Peter I of Cyprus' murder.